You choose: Defective tyre or defective user?

Bought a pair of Tubeless Ready Racing Ralphs for the mythical summer conditions that are just around the corner

First one went one beautifully and held air virtually straight away with a bit of sealant sloshing. The other one has been a nightmare - went on the rim without much fuss, but has had a seemingly endless series of pinhole leaks through the sidewall. I've slooshed and spun the bugger until my arms hurt, reinflated about 20 times, added more sealant, slooshed it again. After a false dawn where I managed a short ride on it, it was flat again the next morning, and pumping it up just blows the sealant out of the pinholes.

Gave up on it this morning and put my fuss-free Captain back on.

Given the massive difference between the two, is this user error? Or dodgy Ralph?

If it's coming through the sidewalls, it's not the rim. And only likely user error would be if you didn't properly shake the sealant bottle. I think maybe a little more patience would sort it- if it stays up for long enough to do a ride, then do more rides, it'll most likely stop after a couple.

Not really a fan of Squabbly TLR- it's weird, I got better results with their pre-TLR snakeskins.

mount the tire, fill with spaff, shake and leave resting horizontally on a bucket or similar for an hour or so, seals all of one side, shake like a monkey boy, stick more air if needed and do the other side.

mount the tire, fill with spaff, shake and leave resting horizontally on a bucket or similar for an hour or so, seals all of one side, shake like a monkey boy, stick more air if needed and do the other side.

I've had this pinhole problem with a TLR Nobby Nic before. Eventually got it sorted by pumping it up to 40 PSI, riding it for as long as possible then pumping it up again. It'll now hold air for about two or three weeks. The other one (same model, bought at the same time) went up straight away and only ever needed 5-10 PSI top ups even after not being ridden for a couple of months.

I used the Snakeskin tubeless ready Nobby Nic's. Both went onto Crest rims without tyre levers and are still up 3 weeks later. The non Snakeskin Schwalbes i've used in the past have all leaked from the side walls. The Snakeskin ones haven't.

What sealant are you using?
We had problems with Schwable tubeless tyres, sent 3 sets back to Fishers before we could get a set to stay up.
Latex sealants (Stans) worked best in the end. The older Bonty super juice was no good apart from in bonty tyres.